Tape-copy-holder attachment for type-writers.



W. STAFFORD. V TAPE COPY HOLDER ATTACHMENT FOR TYPE WRITERS.

nrmonlou mum on. 4, 1913.

Patented July 121,- 1914.

.Ez van/i 07 Ml feaz 2x2 W mrzaeu earns nn'rrnn r arsrrr ora ion GREAT BRITAIN.

rara-eerrnotnea ATTACHMENT roe rrr's wnriiiins.

messes,

tachment for typewriters, of the kind wheretape-guide or holder,

in the tape is drawn across the typewriter in view of the transcriber by means of a spring motor when the transcriber presses a key which controls the operation of said spring motor.

In my improved attachment, the key is arranged to control the spring motor by means of an escapement comprising two detent teeth or arms one of which engages with projections arranged on the periphery of a drum on one of the arbors of the spring motor and prevents rotationof the motor so long as the-releasing key is not depressed,

and the other of projections when the over, by allowing which engages with the said key is depressed. Morethe said arms to abut against the periphery of the drum, large wearing surfaces can be obtained and the durability of the mechanism increased.

By my invention I insure that not more than the desired length of tape shall be fed along-the guide at each depression of. the controlling key, whether such depression is long or short I In the accompanying drawings; 1 have shown how my said invention may be conveniently and advantageously carried into practice. l

In this drawing :-Figure 1 is a perspective view of a typewriter having my inven-- tion applied-thereto. Fig. 2 is a plan of my improved attachment shown. separately. Fig. 3 is a vertical section on the line w, m, Fig. 2, and Fig. t a rear elevation, both drawn to an enlarged scale, showing the spring-motor and connected parts separately.

a is the frame of a type riter, and b the in which the tape rests during transcription. 0 is a casing bolted to the frame a.. d is the tape-feed roller fixed to a shaft 6, rotatably mounted in the upper part of the casing a. This shaft 6 also bears a pinion f gearing with a spur-wheel g rotatably mounted in the casing 0. These parts together with an idle roller h drawn by springs j on to the roller d, are substan- Specification of Letters P aton c. Pa tgntugd July 21, 1914p hfiilibation filed October 4, 1913. Serial No. 793,425.

tial-ly the same as those described in the specification of British Letters Patent no. 15805 of 1911 of which Lam one of thepatentees.

In order to drive the gear wheel 9 and connected parts automatic'ally,the said wheel has fixed thereto a pinion k which gears with a spur-wheel m rotatably mounted on a shaft on. This shaft is rotatably mounted in the casing c and is connected to the wheel m vby means of a spring 0 arranged in a spring barrel 9 mounted on said wheel. The shaft m bears at the front end a handle g, ,whereby it may be turned to wind up the spring 0 and at the rear end a ratchet-wheel 1' which engages with a pawl s to prevent it from being turned back bythe spring 0. Ihe spring barrel go bears on its periphery a series of projections t, t which are spaced at equal distances apart so as to form an escapement-wheel and are adapted to enga e with a pair of detent-arms u, 'v, on a roc shaft w which is pivotally mounted in the casing The rear end of this rock-shaft extends to the exterior, where is provided with a lever arm 00, which is coupled by an adjustable link y to one of the npperends of a T-lever z pivoted at 1 to the bracket 2 supporting the casing e. The other upper end of the T-lever engages with a link or coupling rod 3 actuated by one of the keys of' the typewriter inany suitable known manner.

1 When the parts are at rest, the spring barrel p and connected parts are retained by the engagem nt of the detentarm u with one of the pri j ctions 25. When however the T- responding key, the'said projection t is re by the detent arm a, whereupon it beneath'said arm and comes into ene it with the other detent arm 0 which new es in its path. ()n the release of the key, the arm 2) rises and releases the projection in engagement therewith, while the arm a moves back into the path of the projections. The wheel m then turns until the next projection 25 comes into engagement with the arm u. The feed roller and gearing f, g, in, m, are so proportioned that a length of tape equal to the length of the holder B will be fed into said holder when the Wheel m rotates through angle equivalent to the pitch of the projections t, t on the barrel p. Since one of the detent arms a, 1), always stands in the path of the PYOiQ'J AssIenon *ifo rite OLIVER 'rrrnwnrrnn lever z is-roiiked by the depression of the cort, t, for each 7 roller actiiated by sard spring moisor for 1136' tionsfi, a, there is no risk of the Wheel m rotating through a greater angle than that corresponding tothe pitch of the-projections actuation of the lever z. I r at I claim is: 4 A tape copy holder attachment for typewriting machines, said attachment compris, ing a copy holder,

:of said drurn, amok-shaft arranged adja tent arms mounted on said rock-shaft and adapted to move intoan'd' out of engagement With the periphery of said drum and With said projections, and means for 'operatively donnecting'said rock-shaftand said key;

aspring motor, a driving Witnesses:

GEORGEHARRISQN, I HERBERTA. BEEsToN.

driving the tape along said copy holder, a key, a drum fixed to one of the Wheels of the spring motor, projections on the periphery Copies offthis patent may be obtained for five'cents. each,by addressingthev "Commissioner of Patents, 7

Washington. D.- 0.

'cent to said drum, oppositely-arranged. de-

#WILFRED .$TAF FORD. 

